Precise Measurement of the Solar Neutrino Day/Night and Seasonal Variation in Super-Kamiokande-I

Details Precise Measurement of the Solar Neutrino Day/Night and Seasonal Variation in Super-Kamiokande-I Precise Measurement of the Solar Neutrino Day/Night and Seasonal Variation in Super-Kamiokande-I

2003-09-03

arxiv.org/abs/hep-ex/0309011v1

Phys.Rev.D69:011104,2004

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 7 figures; submitted to Phys. Rev. D (rapid communication)

Scientific paper

10.1103/PhysRevD.69.011104

The time variation of the elastic scattering rate of solar neutrinos with electrons in Super-Kamiokande-I was fit to the variations expected from active two-neutrino oscillations. The best fit in the Large Mixing Angle solution has a mixing angle of tan^2theta=0.55 and a mass squared difference of Deltam^2=6.3times10^-5eV^2 between the two neutrino mass eigenstates. The fitted day/night asymmetry of -1.8+-1.6(stat)+1.3-1.2(syst)% has improved statistical precision over previous measurements and agrees well with the expected asymmetry of -2.1%.

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